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W. V. TURNER. FLUID PRESSURE BRAKE. APPLICATION FILED JUNE 1918.

mm mm, 16, 19419.

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Specification o1 ltcttera Patent.

application tiled tune a, W13. tlerial lt'o. 2%,27t,

To all whom it may concern:

Be it known that l, amen l7. 'lununn, a citizen of the llnited States, residin at 'Willnnsburg, in the county of Alleg eny and State of Pennsylvania, have invented new and useful improvements in llluidr Pressure Brakes, of which the following is a specification."

This lnvention relates to ll'uid pressure brakes, and more particularly to means forobtaining quick serial action in a service application of the brakes. I p

lit has heretofore been proposed to provide means in connection with a, triple or equalizing valve device for ventin fluid from the brake pipe in a service appfication of the. brakes to efi'ect a quick serial action of the brakes throughout the train.

it has also been proposed to provide an 4 equipment havin an equalizing valve device for controllln t e bra es in service and an emergency va ve 'mechamsm tor efiectmg an emergency application of the brakes.

With an. equipment ot ,.the above character, the quick service feature might be incorporated in the equalizin valve device, but this would'necessitate tie enlargement of the slide valve and piston.

in order to avoid the abovechanges in the equalizing valve device, the principal object oi the present invention 13 to incorporate the quick service feature in the emergency valve mechanism, wh-ic modification of t e equipment. v

ln the accompanvin drawing, the single figure is a sectiona v ew of the emergency valve mechanism portion of a brake equip ment, with my improvement embodied til bill

therein. v,

As shown in the'drawing, the emergency valve mechanism may comprise a .oasin 1 having a piston chamber '2 connects through passage 3, quick action valve chamber 1 and passage 5 with brake pipe 6 and containing piston 7 and having a" valve passage 9 to quick chamber 8 connected b action/chamber 10 and contaaning a slide valve 11 and an auxiliary slide valve 12, adated to be operated by piston 7..

l I: casing 1 also has a piston chamber 13 conn to a passage 32 leading to the seat of slide valve 11 and containing quick involves only a slightaction piston 1 1 tor operating quick action.

valve 15, contained in valve chamber l.

According to my invention, in addition to the usual ports and passages of the emergency valve mechanism, there is provided a passage'lfi, leading from piston chamber 2 to the seat of slide valve 11, and containing a check valve 17, a port 18 in slide valve'll, adapted in release position of the slide valve to register with assage 16, a cavity 19 in the auxiliary sli e valve 12, and a passage 20, leadin from the brake cylinder 21 to the seat of sli e valve 11 and containing a check valve 22 and adapted to register with a port 23 in slide valve 11 in the release position of the parts.

In operation, fluid from the brake pipe 6 flows through passage 5 to valve chambep 4:, and through passage 3 to piston chamber 7 fluid at brake pipe pressure, as we 1 as the quick-action chamber 10.

Fluid also flows from valve chamber 8,

thro h port 2 1 and passage 25 to quick action c osing chamber 26.

' When a gradual reductlon in brake pipe pressure is made to efi'ect cation of the. brakes, the piston 7 is moved soas to-engage the yieldlng stop 27 Theauxiliary slide valve 12 is thus shifted, so that the] cavity 19 connects pass es 118 and 23, permitting-fluid to be ven w from the brake pipe to the brake cylinder, so as to efi'ect' quick serial action throughout the train. l

Inthis position, port 28 in auxiliary slide a service appli-- )W 1 valve 12 registers. with port 29 in slide valve 11 and since port 29 registers with exhaust I port 30, fluid is vented from valve chamber 8 and the quickaction chamber 10, and when the pressure in valve chamber '8 is reduced to a; degree slightly less than the reduced brake pipepressure, the piston 7 shlfts the valve 12 so as to out ofi' from the brake pipe to the brake cylinder.

Upon a sudden reduction in brake pipe pressure toeifect an emergency application of'the brakes, the piston 7 is shifted to its the further venting of fluid extreme outer position, overcoming the resistance of the yielding stop 27,

In the emergency position of slide valve 11, cavity 31 connects passage 32 With passage 25, so that fluid is supplied from the quick action closing chamber 26 to quick action piston chamber 13. I Quick action piston 14 is then actuated to open the quick action valvel5, so that fluid is vented from the brake pipe 6 to the vent port 33 at an emergency rate.

With a triple or equalizing valve device, the quick service action is dependent upon the relative volumes of the brake cylinder and auxiliary reservoir, since the movement of the triple valve device to control the quickservice ports is subject to the rate at which fluid is supplied from the auxiliary to the brake cylinder and to the degree at Which the brake cylinder is charged, so that varying sizes of auxiliary reservoirs and brake cylinders influence the action of the quick service feature.

By employing the emergency valve mechanism,-the quick action chamber being of the same volume for all equipments, the action of the mechanism is always constant for a given rate of reduction in brake pipe pressure, and consequently the quick service venting of fluid from the brake pipe is rendered more nearly uniform.

Furthermore, the quick service Venting of fluid from the brake pipe Will continue, so long as the brake pipe pressure is reduced.

Having now described my invention, What I claim as new and desire to secure by Letters Patent, is: 1

1. in a fluid pressure brake, the combinamadam tion With a brake pipe, of an emergency valve mechanism having a piston subject to the opposing pressures of the brake pipe and a quick action chamber and a main Valve operated by said piston upon a sudden reduction in brake pipe pressure and an auxiliary valve operated by said piston and having one position relative to the main Valve for venting fluid from the brake pipe at a service rate and another position for venting fluid from the brake pipe at an emergency rate.

2. In a fluid pressure brake, the combination with a brake pipe of a piston, a main valve adapted to be operated by said piston, and an auxiliary valve having a movement relative to the main valve and adapted to be operated by said piston upon a gradual reduction in brake pipe pressure for venting fluid through ports in the main valve from the brake pipe.

3. In a fluid )ressurc brake, the combination with a brake pipe, of a piston, a main valve adapted to be operated by and having ports for venting fluid from the brake pipe upon movement of said piston under a sudden reduction in brake pipe pres sure, and an auxiliary valve having a movement relative to the main valve and having ports for venting fluid from the brake pipe through ports in the main valve upon movement of said piston under a gradual reduction in brake pipe pressure.

In testimony whereof I have hereunto set my hand.

WALTER V. TURNER.

said piston 

